netdev - Re: [PATCH net-next v3 2/3] net: core: Implement dstats-type stats collections

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Date: Sat, 8 Jun 2024 14:37:23 +0100
From: Simon Horman <horms@...nel.org>
To: Jeremy Kerr <jk@...econstruct.com.au>
Cc: David Ahern <dsahern@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org
Subject: Re: [PATCH net-next v3 2/3] net: core: Implement dstats-type stats
 collections

On Fri, Jun 07, 2024 at 06:25:25PM +0800, Jeremy Kerr wrote:
> We currently have dev_get_tstats64() for collecting per-cpu stats of
> type pcpu_sw_netstats ("tstats"). However, tstats doesn't allow for
> accounting tx/rx drops. We do have a stats variant that does have stats
> for dropped packets: struct pcpu_dstats, but there are no core helpers
> for using those stats.
> 
> The VRF driver uses dstats, by providing its own collation/fetch
> functions to do so.
> 
> This change adds a common implementation for dstats-type collection,
> used when pcpu_stat_type == NETDEV_PCPU_STAT_DSTAT. This is based on the
> VRF driver's existing stats collator (plus the unused tx_drops stat from
> there). We will switch the VRF driver to use this in the next change.
> 
> Signed-off-by: Jeremy Kerr <jk@...econstruct.com.au>

Reviewed-by: Simon Horman <horms@...nel.org>